77706891610812 has 18 divisors (see below), whose sum is σ = 196425753794088. Its totient is φ = 25902297203592.

The previous prime is 77706891610807. The next prime is 77706891610841. The reversal of 77706891610812 is 21801619860777.

77706891610812 is a `hidden beast` number, since 7 + 7 + 7 + 0 + 6 + 8 + 9 + 1 + 610 + 8 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×77706891610812² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77706891610812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1079262383448 + ... + 1079262383519.

Almost surely, 2^{77706891610812} is an apocalyptic number.

It is an amenable number.

77706891610812 is an abundant number, since it is smaller than the sum of its proper divisors (118718862183276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77706891610812 is a wasteful number, since it uses less digits than its factorization.

77706891610812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158524766977 (or 2158524766972 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 63.

The spelling of 77706891610812 in words is "seventy-seven trillion, seven hundred six billion, eight hundred ninety-one million, six hundred ten thousand, eight hundred twelve".